Vibrations!

Vibrations!$2.81

Rated 4.44/5 (27) —  Free Android application by jjbunn

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About Vibrations!

Vibrations is an app for measuring mechanical vibrations and acoustic noise from engines, the environment, machines, and other equipment.

This is (currently) the only app that combines acoustic *and* mechanical measurements!

Uses: monitoring vehicle engine vibration, monitoring vibrations of household appliances (dishwasher, refrigerator, waste disposal units, clothes dryers, etc.), measuring g-force in moving vehicles, helping to identify failing gears, evidenced by knocking sounds, modes, etc..

Vibrations uses data streams from the built-in accelerometer and microphone: it calculates two simultaneous FFTs, one from the mechanical measurements, one from the audible measurements. It then shows the frequency spectra on the screen. The frequency axis is labelled in Hz and RPM (revolutions per minute).

Four on-screen software gauges give an overview of the measurements:

1) The g-force (excluding gravity), which measures acceleration
2) The frequency of the current peak in the mechanical/vibration noise
3) The frequency of the current peak in the acoustic noise
4) The sample rate at which mechanical vibrations are being measured

Screen shots can be taken using the "Save Screen" button, and stored to the SD card.

Time series of accelerometer data (up to 20 seconds) can be recorded and saved using the "Record Data" button. Since data are continually being gathered, the recorded data written to the file actually starts a second or so *before* the button was pressed. Recording can be interrupted while in progress, and the data discarded or saved. Otherwise, the recording will automatically terminate after 20 seconds have elapsed, and the data discarded or saved then.

Data collection can be paused and resumed using the "Pause"/"Resume" button.

This is the first release of this app, and ideas for improvements/enhancements are welcome: please contact me.

Also, please note that the frequency limit of the mechanical vibration measurement is limited by the maximum rate that accelerometer samples can be obtained from the Android device: this typically varies from device to device - e.g. on the Nexus 7 and 10 tablets, the rate is ~200 samples/sec, giving a maximum frequency measurement of ~100Hz or 6000 RPM. On the Galaxy S3 the rate is ~100 samples/sec, giving a maximum frequency of ~50Hz.

How to Download / Install

Download and install Vibrations! version 2.5 on your Android device!
Downloaded 500+ times, content rating: Everyone
Android package: com.julian.apps.Vibrations, download Vibrations!.apk

All Application Badges

Paid
app
Android
3.1+
For everyone
Android app

App History & Updates

What's Changed
v2.5 Added Menu Button
Added Menu Option "Keep Screen On"
Added rate Vibrations option
Cosmetic adjustments to layout
v2.4 Some cosmetic improvements for devices with small screens
v2.3 Added "Record Data" button, which will allow save of up to 20secs of timestamped Accelerometer data
The files contain tab-delimited time (secs) ,accx,accy,accz,accmag (m/s^2) values.
(Saved data files are placed in the "Vibrations" directory on the SD card)First release.
Price update  Price changed from $2.49 to $2.81.
Version update Vibrations! was updated to version 2.5
Price update  Price changed from $1.49 to $2.49.
More downloads  Vibrations! reached 500 - 1 000 downloads

What are users saying about Vibrations!

X70%
by X####:

Files are saved as dat files. No biggee, but wish I could open in my phone. I can't view them in my phone once saved. Did I miss a setup item somewhere for selecting what format to save in or app for viewing? Also, make the gauges at the top selectable for recording by toggle-by-touch.

N70%
by N####:

Great appreciation, very sensitive. Highly recommended. Thanks for another very useful app.

Q70%
by Q####:

This app works very well and is very sensitive.

G70%
by G####:

Great for diagnosing vehicle vibrations

M70%
by M####:

Attempting to troubleshoot a drive-line vibration, saved data but can't open it on phone?

Q70%
by Q####:

There are two things to be improved 1) RPM and frequency estimation precision threshold - it would be nice if it was customizable. 2) Log length limit is a minor issue. Still, I haven't found any other apps for on-the-go vibration-to-RPM analysis. Clibrated a couple of lab centrifuges with it - the app is perfect for this.

Q70%
by Q####:

Perfect

Z70%
by Z####:

Use this app for NVH diagnosis on cars. Also works great as a single cylinder tachometer. Picks up frequencies fast and is very accurate. I do have a question, when I save an image I get a 0kb blank file that wont open, also it saves as a PNG which my phone wont pick up right, is it my phone doing this or a bug? A suggestion I have is a freeze screen button. Sometimes I can't see the screen if the frequency is too severe, if I could freeze the screen and read the Hz real quick it would be nice

Q70%
by Q####:

Measured frequency on a variable speed compressor very precisely. Sadly it works only in 50 Hz range on my phone. Acoustic measurements r not as precise as meachanical. But still great app! I wish there were more adjustments and options if author still works on it.


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Rating Distribution

RATING
4.45
27 users

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